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Type :
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alternator
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Specification :
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24V 80A
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Pulley :
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Brand :
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NUOJIN
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Number :
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0124555007
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Quality :
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Remanufacture
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Delivery time :
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10 day
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The installation of the 24V generator for Scania models must comply with heavy-duty commercial vehicle electrical installation specifications and be performed in conjunction with the matching characteristics of its engine. Below are the detailed installation steps, which must also be executed in accordance with Scania's dedicated installation requirements:
First, turn off the vehicle engine, engage the handbrake, and disconnect the negative terminal of the 24V battery (most Scania models use two 12V batteries in series; the main negative line must be disconnected) to avoid short circuits during wiring. Prepare socket wrenches, torque wrenches, cleaning tools, petroleum jelly, as well as PVC 105°C type RK cables and grade 8.8 mounting bolts that meet Scania's specifications.
Verify that the model of the new generator matches the Scania vehicle. Check that the generator housing and terminal blocks are undamaged, and that the rotor rotates smoothly without jamming. Additionally, confirm the integrity of supporting accessories such as belts and gaskets. For dual-generator configurations, extra checks on the compatibility of the two generators are required.
Clean dust, oil, and rust from the generator mounting base on the engine. Inspect the bolt holes of the mounting base for thread damage; any damage must be repaired first to ensure a flat mounting surface and prevent uneven stress on the generator after installation.
If an old generator was removed, place the new generator on the mounting base at the original installation angle. Temporarily fasten it with bolts without fully tightening to leave adjustment space. For new installations or single-bearing generators, ensure the coaxiality of the connection between the generator and the engine flywheel housing, with the deviation controlled within 0.1mm. Fine-tune and level using thin metal shims if necessary.
Use a torque wrench to uniformly tighten the mounting bolts diagonally according to Scania's specified torque. Ensure the generator base pad is fully seated and the frame is not deformed, while avoiding excessive tightening that could damage the housing. If there is a small generator bracket, manually pre-tighten the bracket first before securing the main bolts.
Rotate the engine belt tensioner and fit the drive belt onto the generator pulley and the corresponding engine pulley, ensuring the belt fits snugly in the pulley groove without misalignment.
Adjust the tensioner to achieve appropriate belt tension — press the middle of the belt, and the deflection should be within a reasonable range. Excessively loose belts may slip and affect power generation, while overly tight belts will accelerate generator bearing wear. After installation, rotate the pulley to confirm smooth operation without jamming.
Scania 24V generators are typically marked with terminals such as B+, F, and E. First, connect the thick red cable between the generator's B+ terminal and the battery's positive terminal. The cable must have a suitable cross-sectional area (to avoid overheating), and a thin layer of petroleum jelly can be applied to the connection to prevent rust.
Connect the excitation wire (thin wire) to the F terminal, with the other end connected to the corresponding interface of the engine control unit. The E terminal must be reliably connected to the engine block or frame ground point to ensure a secure ground connection. For dual-generator configurations, the negative terminals of the batteries corresponding to the two generators must be connected; otherwise, fault codes may be triggered.
Organize the wiring to ensure cables maintain a distance of at least 40mm from the exhaust pipe and 60mm from the coolant pipes to prevent heat damage. Secure the cables with cable ties to avoid 晃动 and wear during vehicle operation.
Reconnect the negative terminal of the battery. Check that all bolts and terminal blocks are tight, the belt is properly installed, and no accessories are missing before starting the engine.
Observe whether the dashboard charging indicator light turns off normally. Use a multimeter to measure the generator output voltage — the normal output voltage for a 24V system should be stably around 27-29V.
During the test run, listen for abnormal noises from the generator (such as bearing squeaks or belt slipping sounds) and check for overheating or sparking at the wiring connections. If it is a dual-generator configuration, confirm through the control unit that both generators are charging normally without fault codes.
The core precautions for the installation of Scania 24V generators revolve around safety protection, installation accuracy, electrical matching, and operation verification. Details are as follows:
Keep the main negative terminal of the battery disconnected throughout the process to avoid short circuits and sparks during wiring. Reconnect it only after the installation is completed.
Stay away from high-temperature engine components (exhaust pipes, turbochargers). Maintain a safe distance for wiring and hand operations to prevent scalding.
Do not touch the generator's B+ terminal and the ground point simultaneously with metal tools, as this may cause an instantaneous short circuit and damage the generator or battery.
The mounting base must be clean and flat. Tighten the bolts diagonally according to Scania's specified torque to prevent vibration and loosening during generator operation.
Ensure coaxiality between the generator and the engine pulley, with the deviation not exceeding 0.1mm. Otherwise, it will accelerate the wear of the belt and bearings.
The belt tension should be moderate. An overly loose belt may slip and result in insufficient power generation, while an overly tight belt will lead to premature bearing damage. After installation, manually rotate the pulley to check for no jamming.
Select matching cables (thick wires for B+ terminals, thin wires for excitation terminals). Insufficient cross-sectional area will cause line overheating and reduced power generation efficiency.
The ground wire (E terminal) must be reliably connected to the engine block or frame, with no rust on the contact surface. Otherwise, abnormal charging and fault code alarms may occur.
For dual-generator configurations, ensure the negative lines of the two generators are connected. Independent grounding will cause electrical conflicts and trigger the vehicle fault light.
Route wires away from high-temperature components and coolant pipes. Secure them firmly to avoid shaking, wear, and insulation damage leading to short circuits during driving.
Before starting the engine, recheck that all wiring terminals are tight, the belt is properly installed, and there is no foreign object entanglement.
After startup, observe whether the charging indicator light turns off normally. Use a multimeter to measure the output voltage (27-29V is normal). Immediately shut down and inspect if the voltage is too high or too low.
During the test run, monitor for abnormal noises from the generator (such as bearing abnormal sounds or belt slipping sounds) and check for overheating or peculiar odors at the wiring connections. Shut down and troubleshoot immediately if any issues are found.
References：
The content you previously viewed regarding the installation methods and precautions for Scania 24V generators is not derived from a single official original text or fixed document. Instead, it is a practical summary compiled and organized based on Scania's official maintenance specifications, general installation standards for industrial generators, and relevant technical data. Its core basis and reference sources are as follows:
Technical documents for specific models, such as the Scania DC09 Installation Manual, clearly specify key details. These include that the 24V system must consist of two 12V batteries connected in series, dual generators require the negative terminals of the batteries to be connected to avoid fault codes, and wires must maintain a distance of at least 40mm from the exhaust pipe. These details serve as the core basis for the aforementioned installation methods and precautions. Additionally, specifications in the manuals regarding terminal connections, bolt torque, and rust prevention with petroleum jelly align with the electrical connection and installation accuracy requirements in the summary.
Requirements mentioned in some industrial machinery installation materials—such as the coaxiality deviation being controlled within 0.1mm during the installation of single-bearing generators, and grade 8.8 mounting bolts being uniformly tightened diagonally with a torque wrench—are fully consistent with the precision specifications for the positioning and securing stage in the summary. These documents supplement the technical standards for general installation operations.
Content related to automotive generator installation published on platforms like PCauto covers general safety and commissioning processes. These include disconnecting the negative terminal of the battery to prevent short circuits, adjusting belt tension, and measuring output voltage after installation. Such processes are logically consistent with the installation of commercial vehicle generators like the Scania 24V generator, providing references for the practical workflow in the summary.
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